fuzz: improve bolt11 target #6805
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This prevents a buffer overflow in the custom mutator that can occur when data_maxlen is 0.
These can be used in custom mutators for libFuzzer targets.
This mutator helped the fuzzer find new coverage and detect the bug fixed in 87f4907.
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The main contribution of this PR is a crossover mutator for @dergoegge's bolt11 fuzz target.
With the new mutator and the previous improvements to the target, we were able to add over 2k new interesting inputs to the corpus.